ST92124JDR9TB View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92124JDR9TB

8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E³ ™ (EMULATED EEPROM), CAN 2.0B AND J1850 BLPD

STMicroelectronics 

ST92F124/F150/F250 - KNOWN LIMITATIONS

KNOWN LIMITATIONS (Cont’d)

Here is an example of a patch for the MFT1 using

DMA in ouput compare mode, inserted at the be-

ginning of the MFT0 interrupt routine:

spp #8 ;Set to page 8 (mft1)

tm T_IDMR,#0x08 ;test mft0 OCMP dma

mask bit

jxnz MFT0_it_routine

cpw DMA_CNT1,#0 ;If the DMA count is

not at zero the block did not complete

jxeq MFT0_it_routine

and T_FLAGR,#11011111b ;Clear dma

compare interrupt request

or T_IDMR,#0x08 ;Re-enable the com-

pare 0 dma

MFT0_it_routine: ;MFT0 interrupt rou-

tine code

In addition, the peripheral DMA priorities must be

organized so that the MFT DMA priorities are the

highest. This way the impact is limited: DMA re-

quests with the wrong Mask Bit Reset are serv-

iced.

Workaround Limitation

If the counter event period is too short, the failure

recovery in the interrupt routines will not work.

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